Ultra-wide angle imaging system

Abstract

An ultra-wide-angle imaging system of the present application comprises, in order from the object side to the image side along the optical axis, a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power, and a protective flat glass. The first lens is a convex-concave lens, the second lens is a convex-concave lens, the image side surface of the third lens is a convex surface, the object side surface of the fourth lens is a concave surface, the image side surface of the fifth lens is a convex surface, the sixth lens is a double-convex lens, the seventh lens is a double-convex lens, the object side surface of the eighth lens is a concave surface, and the image side surface of the ninth lens is a convex surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and particularly relates to a large-aperture, high-resolution, small-volume super-wide-angle imaging system. BACKGROUND

[0002] With the continuous progress of science and technology and the continuous development of society, in recent years, optical imaging systems have also developed rapidly and are widely used in security monitoring, unmanned aerial vehicle shooting, mobile phone shooting, machine vision, action cameras and other fields. Therefore, the requirements for super-wide-angle imaging systems are also becoming higher and higher. The angle of shooting, the large amount of light, and the high-definition picture are often the difficulties in the development of lenses. In the prior art, the super-wide-angle imaging system still has the following defects:

[0003] 1. The super-wide-angle lens often has a large head and is heavy;

[0004] 2. The aperture of the lens that meets certain image quality requirements is often small;

[0005] 3. Most super-wide-angle lenses do not have high-definition image quality.

[0006] Therefore, there is an urgent need in the market for an imaging system that can realize super-wide-angle, large-aperture, high-resolution, and small volume. SUMMARY

[0007] The purpose of the present application is to solve the above problems and provide a super-wide-angle imaging system that can realize super-wide-angle, large-aperture, high-resolution, and small volume.

[0008] To achieve the above purpose, the present application provides a super-wide-angle imaging system, which comprises, in order along the optical axis from the object side to the image side: a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, and a ninth lens with positive focal power, wherein the first lens and the second lens are both convex-concave lenses.

[0009] The image side of the third lens, the fifth lens, and the ninth lens is a convex surface;

[0010] The object side of the fourth lens and the eighth lens is a concave surface;

[0011] The sixth lens and the seventh lens are both double-convex lenses.

[0012] According to one aspect of the present application, the first lens to the ninth lens are all glass lenses along the optical axis from the object side to the image side.

[0013] According to an aspect of the present application, a diaphragm is disposed between the fifth lens and the sixth lens.

[0014] According to an aspect of the present application, the imaging system has four aspherical lenses.

[0015] According to an aspect of the present application, the fifth lens and the ninth lens are aspherical lenses.

[0016] According to an aspect of the present application, the seventh lens and the eighth lens are cemented.

[0017] According to an aspect of the present application, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following relationship: 0.2≤f1 / f2≤0.9.

[0018] According to an aspect of the present application, the effective focal length f2 of the second lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4.5≤f2 / f≤-3.0.

[0019] According to an aspect of the present application, the effective focal length f3 of the third lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.9≤f3 / f≤5.0.

[0020] According to an aspect of the present application, the effective focal length f4 of the fourth lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4.0≤f4 / f≤-0.9.

[0021] According to an aspect of the present application, the effective focal length f5 of the fifth lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.4≤f5 / f≤5.6.

[0022] According to an aspect of the present application, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy the following relationship: 0.5≤f5 / f6≤2.5.

[0023] According to an aspect of the present application, the effective focal length f7 of the seventh lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.6≤f7 / f≤2.3.

[0024] According to an aspect of the present application, the effective focal length f8 of the eighth lens and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -1.6≤f8 / f≤-0.8.

[0025] According to an aspect of the present application, the combined focal length f78 of the seventh lens and the eighth lens and the effective focal length f9 of the ninth lens satisfy the following relationship: -2.8≤f78 / f9≤-1.0.

[0026] According to an aspect of the present application, a combined focal length fa of the first lens, the second lens, the third lens, the fourth lens and the fifth lens and an effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4.0≤fa / f≤6.0.

[0027] According to an aspect of the present application, a combined focal length fb of the sixth lens, the seventh lens, the eighth lens and the ninth lens and an effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 2.1≤fb / f≤3.5.

[0028] According to an aspect of the present application, a back focal length BFL of the ultra-wide-angle imaging system and a total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.1≤BFL / TTL≤0.3.

[0029] According to an aspect of the present application, a total optical length TTL of the ultra-wide-angle imaging system and an effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 8≤TTL / f≤8.9.

[0030] According to an aspect of the present application, an air separation C56 of the fifth lens and the sixth lens and a total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.0≤C56 / TTL≤0.3.

[0031] According to an aspect of the present application, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis and a total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.05≤(CT4+CT5) / TTL≤0.4.

[0032] According to an aspect of the present application, a half of a diagonal length IH of an effective pixel area on an imaging surface of the ultra-wide-angle imaging system and an effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.1≤IH / f≤1.7.

[0033] According to an aspect of the present application, an effective half-aperture DT11 of an object side surface of the first lens and an effective half-aperture DT31 of an object side surface of the third lens, an effective half-aperture DT32 of an image side surface of the third lens satisfy the following relationship: 0.6≤DT11 / (DT31+DT32)≤1.4.

[0034] According to an aspect of the present application, an effective focal length f2 of the second lens and a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis satisfy the following relationship: 5.5≤f2 / (CT2-CT3)≤20.

[0035] According to an aspect of the present application, the effective focal length f3 of the third lens and the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis satisfy the following relationship: -25≤f3 / (CT2-CT3)≤-3.

[0036] According to an aspect of the present application, the radius of curvature R71 of the object side surface of the seventh lens at the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy the following relationship: 1.6≤R71 / CT7≤8.6.

[0037] According to an aspect of the present application, the total optical length TTL of the super wide-angle imaging system and the central thickness CT8 of the eighth lens on the optical axis satisfy the following relationship: 38.1≤TTL / CT8≤38.6.

[0038] According to the super wide-angle imaging system of the present application, nine lenses are configured, the positive and negative focal lengths of the lenses are reasonably distributed, the concave-convex shapes of the lenses are optimized, and the reasonable parameters are set, so that the super wide-angle (FOV=160°), large aperture (FNO=1.8) are realized, the high resolution (thirty-five million pixels), light weight, small volume are achieved, and the non-defocus during high and low temperature (-40-85°) process is realized, so as to ensure the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Fig. 1 is a structural schematic diagram of the super wide-angle imaging system of the present application in embodiment 1;

[0040] Figure 2 Fig. 2 is a structural schematic diagram of the super wide-angle imaging system of the present application in embodiment 2;

[0041] Figure 3 Fig. 3 is a structural schematic diagram of the super wide-angle imaging system of the present application in embodiment 3;

[0042] Figure 4 Fig. 4 is a structural schematic diagram of the super wide-angle imaging system of the present application in embodiment 4. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0044] In the description of the embodiments of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" express the orientation or positional relationship based on the orientation or positional relationship shown in the relevant drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0045] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging side is called the image side surface of the lens.

[0046] The present application will be described in detail below in conjunction with the drawings and specific embodiments, but the embodiments of the present application are not limited to the following embodiments.

[0047] Figure 1 is a schematic representation of the structure of an ultra-wide-angle imaging system according to an embodiment of the present application. As shown in Figure 1 The ultra-wide-angle imaging system of the present application comprises, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a protective flat glass, wherein the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 form a rear lens group, and the nine lenses are all glass lenses.

[0048] The first lens L1 is a convex-concave lens with negative focal power, which is beneficial to reducing the angle of large-angle light and reducing the light incidence angle of the rear lens group, and is more beneficial to the correction of aberration of the rear lens group.

[0049] The second lens L2 is a convex-concave lens with negative focal power, which can further reduce the angle of large-angle light and share some negative focal power of the first lens L1, and is more beneficial to the improvement of relative illumination.

[0050] The image side surface of the third lens L3 is a convex surface, has positive focal power, and is beneficial to compensate for chromatic aberration, field curvature and other aberrations generated by the first lens L1 and the second lens L2, and reduce the pressure on the rear lens group to correct aberration.

[0051] The object side surface of the fourth lens L4 is a concave surface, has negative focal power, is beneficial to further reduce the incidence angle of light in the outer field of view, and is beneficial to meet the requirement of a larger aperture.

[0052] The image side surface of the fifth lens L5 is a convex surface, has positive focal power, and is beneficial to better correct aberration in the central field of view region and more beneficial to realize a larger FNO requirement.

[0053] The sixth lens L6 is a double convex lens with positive focal power, is beneficial to converge light and make the light enter the rear imaging system, and is beneficial to shorten the total length of the system.

[0054] The seventh lens L7 is a double convex lens with positive focal power, is beneficial to lower the large-angle light near the stop, and can make more light enter the rear lens.

[0055] The object side surface of the eighth lens L8 is a concave surface, has negative focal power, and is set as a double cemented lens with the seventh lens L7, which is beneficial to correct chromatic aberration and has good tolerance sensitivity.

[0056] The image side surface of the ninth lens L9 is a convex surface, has positive focal power, can effectively compress light, is beneficial to tighten the light beam and reduce the chief ray angle, and is beneficial to match the chip CRA curve requirement.

[0057] The ninth lens L9 is a non-spherical surface, is beneficial to correct the distortion of the edge field of view, and can better meet the imaging quality requirement.

[0058] In the embodiment of the application, preferably, the imaging system has four non-spherical lenses.

[0059] In the embodiment of the application, preferably, the effective focal length f1 of the first lens L1 and the effective focal length f2 of the second lens L2 satisfy the following relationship: 0.2≤f1 / f2≤0.9, and when the above relationship is satisfied, the incidence angle of the imaging system is controlled, and a large field of view angle is realized.

[0060] In the embodiment of the application, preferably, the effective focal length f2 of the second lens L2 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4.5≤f2 / f≤-3.0, and when the above relationship is satisfied, the second lens has appropriate negative focal power, effectively corrects the aberration caused by the front lens, reduces f-Theta distortion, improves spatial angle resolution, and reduces the distortion degree of the edge image, and preferably, the above relationship is -4.3≤f2 / f≤-3.36.

[0061] In the embodiment of the present application, preferably, the effective focal length f3 of the third lens L3 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.9≤f3 / f≤5.0. When the above relationship is satisfied, the light beam of the front lens group can be well received, and the off-axis higher-order coma and astigmatism introduced by the continuous compression of the light rays of the front lens group (negative lens group) can be eliminated, wherein the above relationship is preferably 2.18≤f3 / f≤4.85.

[0062] In the embodiment of the present application, preferably, the effective focal length f4 of the fourth lens L4 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4≤f4 / f≤-0.9. When the above relationship is satisfied, the optical trend in the front can be reasonably controlled, and the transition to the rear can be smooth, wherein the above relationship is preferably -2.45≤f4 / f≤-0.9.

[0063] In the embodiment of the present application, preferably, the effective focal length f5 of the fifth lens L5 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.4≤f5 / f≤5.6. When the above relationship is satisfied, the light rays in the front can be smoothly converged near the optical axis, and the off-axis wide light beam aberration and field curvature can be better converged, which positively affects the improvement of the edge image quality, wherein the above relationship is preferably 1.45≤f5 / f≤2.85.

[0064] In the embodiment of the present application, preferably, the effective focal length f5 of the fifth lens L5 and the effective focal length f6 of the sixth lens L6 satisfy the following relationship: 0.5≤f5 / f6≤2.5. When the above relationship is satisfied, by reasonably controlling the focal lengths of the two lenses in front and behind the stop, the aberration brought by the front lens group can be better corrected, the higher-order spherical aberration and coma can be improved, which is beneficial to realizing high resolution and making the overall resolution more uniform.

[0065] In the embodiment of the present application, preferably, the effective focal length f7 of the seventh lens L7 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.6≤f7 / f≤2.3, and preferably 1.75≤f7 / f≤2.31.

[0066] The effective focal length f8 of the eighth lens L8 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -1.6≤f8 / f≤-0.8, and preferably -1.62≤f8 / f≤-1.0.

[0067] By setting the structure of the two lenses with positive and negative refractive power being glued together, the correction of chromatic aberration is facilitated, thereby improving the imaging quality of the imaging system; meanwhile, the positive and negative lenses are matched, which can effectively eliminate the large-aperture spherical aberration and improve the image surface imaging quality while amplifying the light beam.

[0068] In the embodiments of the present application, preferably, the combined focal length f78 of the seventh lens L7 and the eighth lens L8 and the effective focal length f9 of the ninth lens L9 satisfy the following relationship: -2.8≤f78 / f9≤-1.0. When the above relationship is satisfied, the focal length values of the last three lenses are reasonably set, which is beneficial to the athermalization design of the imaging system.

[0069] In the embodiments of the present application, preferably, the combined focal length fa of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4≤fa / f≤6.0. When the above relationship is satisfied, the incident light beams of the front lens group of the focusing imaging system are beneficial to the effective transmission of the image information collected by the imaging system to the rear of the imaging system.

[0070] In the embodiments of the present application, preferably, the combined focal length fb of the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 2.1≤fb / f≤3.5. When the above relationship is satisfied, the incident light height of the light rays exiting the imaging system is beneficial to the control, the aberration and the outer diameter of the lens of the imaging system are reduced; and the field curvature generated by the front lens group can be corrected, and the influence of the field curvature on the resolving power is reduced. Preferably, the above relationship is 2.1≤fb / f≤3.5.

[0071] In the embodiments of the present application, preferably, the back focal length BFL of the ultra-wide-angle imaging system and the total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.1≤BFL / TTL≤0.3. When the above relationship is satisfied, by reasonably configuring the ratio of the back focal length and the total length, the imaging system can be applied to most optical products. Preferably, the above relationship is 0.10≤BFL / TTL≤0.17.

[0072] In the embodiments of the present application, preferably, the total optical length TTL of the ultra-wide-angle imaging system and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 8≤TTL / f≤8.9. When the above relationship is satisfied, by reasonably configuring the ratio of the total length and the focal length of the imaging system, the imaging system has the characteristics of small volume.

[0073] In the embodiments of the present application, preferably, the air gap C56 of the fifth lens L5 and the sixth lens L6 and the total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.0≤C56 / TTL≤0.3. When the above relationship is satisfied, the air gap between the fifth lens L5 and the sixth lens L6 is reasonably controlled, which is beneficial to the smooth transition of the light rays, improves the production yield of the product and reduces the production cost. Preferably, the above relationship is 0.01≤C56 / TTL≤0.3.

[0074] In the embodiments of the present application, preferably, the central thickness CT4 of the fourth lens L4 on the optical axis, the central thickness CT5 of the fifth lens L5 on the optical axis and the total length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.05≤(CT4+CT5) / TTL≤0.4. When the above relationship is satisfied, by controlling the central thickness and the total length of the fourth lens L4 and the fifth lens L5, the total length can be reduced, and miniaturization can be achieved.

[0075] In the embodiments of the present application, preferably, half of the diagonal length IH of the effective pixel area on the imaging surface of the ultra-wide-angle imaging system and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.1≤IH / f≤1.7. When the above relationship is satisfied, the imaging system has the characteristics of large imaging surface and large aperture.

[0076] In the embodiments of the present application, preferably, the effective half aperture DT11 of the object side of the first lens L1, the effective half aperture DT31 of the object side of the third lens L3 and the effective half aperture DT32 of the image side of the third lens L3 satisfy the following relationship: 0.6≤DT11 / (DT31+DT32)≤1.4. When the above relationship is satisfied, the front-end size of the imaging system can be reduced, the characteristics of thinness can be achieved, the incident light ray trend can be reasonably limited, the poor-quality light rays can be removed, the off-axis aberration can be reduced, and the resolving power of the imaging system can be effectively improved.

[0077] In the embodiments of the present application, preferably, the effective focal length f2 of the second lens L2, the central thickness CT2 of the second lens L2 on the optical axis and the central thickness CT3 of the third lens L3 on the optical axis satisfy the following relationship: 5.5≤f2 / (CT2-CT3)≤20.

[0078] The effective focal length f3 of the third lens L3, the central thickness CT2 of the second lens L2 on the optical axis and the central thickness CT3 of the third lens L3 on the optical axis satisfy the following relationship: -25≤f3 / (CT2-CT3)≤-3.

[0079] By reasonably matching the relationship between the central thicknesses of the second lens L2 and the third lens L3 on the optical axis, the refractive power of the second lens L2 with negative refractive power and the third lens L3 with positive refractive power can also be reasonably matched, so that the aberrations can be mutually corrected.

[0080] In the embodiments of the present application, preferably, the radius of curvature R71 of the object side of the seventh lens L7 at the optical axis and the central thickness CT7 of the seventh lens L7 on the optical axis satisfy the following relationship: 1.6≤R71 / CT7≤8.6. When the above relationship is satisfied, the radius of curvature of the object side of the seventh lens L7 can be avoided to be too large, the surface shape can be avoided to be too flat, the risk of ghost image generation can be reduced, and the resolving power of the imaging system can be improved to achieve high-pixel effect of the imaging system.

[0081] In the embodiment of the present application, preferably, the total length TTL of the super-wide-angle imaging system and the central thickness CT8 of the eighth lens L8 on the optical axis satisfy the following relationship: 38.1≤TTL / CT8≤38.6. When the above relationship is satisfied, the ratio of the thickness of the eighth lens L8 on the optical axis to the distance from the object side of the first lens L1 to the imaging surface on the optical axis is reasonably controlled, which is beneficial to control the total length of the imaging system, so that the structure of the imaging system is more compact, and at the same time, it is beneficial to realize the required field of view angle of the imaging system. If the thickness of the eighth lens L8 is too large, ghosting is easily generated with the reflection of the ninth lens L9, which affects the monitoring picture quality.

[0082] In the embodiment of the present application, preferably, the super-wide-angle imaging system has the characteristics of a large image surface, and the imaging target surface can reach 1 / 1.8”. The chief ray incidence angle CRA of the super-wide-angle imaging system is less than 18°, which can be adapted to multiple large target surface sensors, has a wide application prospect, and improves the market competitiveness.

[0083] In the embodiment of the present application, preferably, the super-wide-angle imaging system can realize a large aperture of FNO1.8, can achieve a field of view angle of 160°, and has a resolution of up to 35 million pixels.

[0084] In the embodiment of the present application, preferably, the super-wide-angle imaging system can realize non-axicon during high and low temperature processes, and maintains high image quality in the temperature range of-40° to 85°.

[0085] The following four groups of specific embodiments are given according to the above settings of the present application to specifically illustrate the super-wide-angle imaging system according to the present application. Because the super-wide-angle imaging system according to the present application has nine lenses, the seventh lens L7 and the eighth lens L8 have three surfaces after being cemented together, and adding the object surface OBJ, the diaphragm STO, the protective glass C and the image surface IMA, a total of 22 surfaces are counted. In order to facilitate the description, the nine lens surfaces, the diaphragm STO and the protective glass C are numbered as S1, S2 to S20. And the aspheric surface satisfies the following formula:

[0086]

[0087] In the formula, z is the axial distance from the curve to the vertex at a position along the optical axis and perpendicular to the optical axis with a height of h; c represents the curvature at the vertex of the aspheric surface; k is the conic coefficient; A4, A6, A8, A 10 , A 12 , A 14 , A 16 …… are the aspheric coefficients of the fourth order, the sixth order, the eighth order, the tenth order, the twelfth order, the fourteenth order, the sixteenth order…… respectively.

[0088] The data of the four groups of embodiments are as follows in Table 1:

[0089] Conditional Example 1 Example 2 Example 3 Example 4 0.2 ≤ f1 / f2 ≤ 0.9 0.649 0.601 0.520 0.535 -4.5 ≤ f2 / f ≤ -3.0 -3.385 -3.703 -3.628 -3.575 1.9 ≤ f3 / f ≤ 5.0 4.225 4.705 2.223 4.392 -4 ≤ f4 / f ≤ -0.9 -3.739 -2.067 -1.028 -1.970 -1.4 ≤ f5 / f ≤ 5.6 5.388 1.821 1.693 2.131 0.5 ≤ f5 / f6 ≤ 2.5 2.081 0.560 0.706 0.860 1.6 ≤ f7 / f ≤ 2.3 1.830 2.119 1.924 1.992 -1.6 ≤ f8 / f ≤ -0.8 -1.363 -1.456 -1.035 -1.067 -2.8 ≤ f78 / f9 ≤ -1.0 -2.487 -1.301 -1.718 -1.266 -4.0 ≤ fa / f ≤ 6.0 -2.543 5.437 -1.782 -3.564 2.1 ≤ fb / f ≤ 3.5 2.449 3.253 2.351 2.509 0.1 ≤ BFL / TTL ≤ 0.3 0.130 0.130 0.145 0.131 8.0 ≤ TTL / f ≤ 8.9 8.366 8.360 8.612 8.244 0.0 ≤ C56 / TTL ≤ 0.3 0.004 0.056 0.003 0.017 0.05 ≤ (CT4+CT5) / TTL ≤ 0.4 0.109 0.142 0.107 0.155 1.1 ≤ IH / f ≤ 1.7 1.443 1.442 1.485 1.422 0.6 ≤ DT11 / (DT31+DT32) ≤ 1.4 1.138 1.076 0.809 1.012 5.5 ≤ f2 / (CT2-CT3) ≤ 20 6.087 19.506 5.937 11.642 -25 ≤ f3 / (CT2-CT3) ≤ -3 -7.598 -24.785 -3.637 -14.302 1.6 ≤ R71 / CT7 ≤ 8.6 2.665 8.190 2.327 2.966 38.1 ≤ TTL / CT8 ≤ 38.6 38.316 38.320 38.330 38.319

[0090] Table 1

[0091] Embodiment 1

[0092] Figure 1 It is a structural schematic diagram of the ultra-wide-angle imaging system in Embodiment 1 of the present application.

[0093] In Embodiment 1, along the direction of the optical axis from the object side to the image side, the third lens L3 is a convex-convex lens, the fourth lens L4 is a concave-convex lens, the fifth lens L5 is a concave-convex lens, the eighth lens L8 is a concave-convex lens, and the ninth lens L9 is a concave-convex lens; the second lens L2, the fourth lens L4, the fifth lens L5, and the ninth lens L9 are aspherical lenses.

[0094] Table 2 below lists the relevant parameters of each lens in the present embodiment, including the surface type, the curvature radius R value, the thickness, the refractive index of the material, and the Abbe number:

[0095] Surface No. Surface Type R Value Thickness Refractive Index Abbe Number S1 Sphere 21.575 0.600 1.80 46.6 S2 Sphere 3.942 1.840 S3 Asphere 11.651 0.900 1.50 81.6 S4 Asphere 3.236 1.616 S5 Sphere 19.803 2.428 1.81 25.5 S6 Sphere -17.239 0.620 S7 Asphere -4.898 1.212 1.85 40.1 S8 Asphere -12.246 0.113 S9 Asphere -14.188 1.290 1.64 55.2 S10 Asphere -5.902 0.625 S11 (STO) Sphere Infinity -0.525 S12 Sphere 5.637 1.817 1.50 81.6 S13 Sphere -8.586 1.246 S14 Sphere 8.649 3.246 1.50 81.6 S15 Sphere -3.097 0.600 1.85 23.8 S16 Sphere -85.491 0.918 S17 Asphere -140.268 1.454 1.82 24.1 S18 Asphere -8.916 2.100 S19 Sphere Infinity 0.500 1.52 64.2 S20 Sphere Infinity 0.389 IMA Sphere Infinity - -

[0096] Table 2

[0097] Table 3 lists the aspherical coefficients of each aspherical lens in the present embodiment. K is the quadratic surface constant of the surface, A4, A6, A8, A 10 , and A 12 are the aspherical coefficients of the fourth order, the sixth order, the eighth order, the tenth order, and the twelfth order, respectively.

[0098] Surface No. K [A4] [A6] [A8] A 10 ]]> A 12 ]] S3 0.0000 4.3567E-03 -3.8961E-04 2.0148E-05 -6.2632E-07 6.9469E-09 S4 0.0000 3.8741E-03 -3.9573E-04 -3.6259E-05 5.0977E-06 -3.6067E-07 S7 0.0000 1.4274E-03 2.3406E-04 -7.1871E-05 6.3499E-06 -2.0466E-07 S8 0.0000 2.7253E-03 1.6845E-03 -4.6179E-04 4.7148E-05 -1.8490E-06 S9 0.0000 1.7905E-03 2.0980E-03 -5.5246E-04 6.1117E-05 -2.3181E-06 S10 0.0000 1.1076E-04 9.7546E-06 2.9315E-05 -4.7047E-06 5.9060E-07 S17 0.0000 -3.0730E-03 -2.9494E-04 4.3411E-05 -7.8191E-06 4.5146E-07 S18 0.0000 -6.2055E-04 -2.5166E-04 2.6059E-05 -2.8795E-06 1.1856E-07

[0099] Table 3

[0100] According to Figure 1 and Tables 1-3, the present embodiment can provide an ultra-wide-angle imaging system with ultra-wide-angle, large aperture, high resolution, and small volume.

[0101] Embodiment 2

[0102] Figure 2 It is a structural schematic diagram of the ultra-wide-angle imaging system in Embodiment 2 of the present application.

[0103] In Embodiment 2, along the direction of the optical axis from the object side to the image side, the third lens L3 is a convex-convex lens, the fourth lens L4 is a concave-concave lens, the fifth lens L5 is a convex-convex lens, the eighth lens L8 is a concave-convex lens, and the ninth lens L9 is a concave-convex lens; the second lens L2, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0104] The following table 4 lists the relevant parameters of each lens of the present embodiment, including surface type, curvature radius R value, thickness, refractive index of material, Abbe number:

[0105] Surface No. Surface Type R Value Thickness Refractive Index Abbe Number S1 Sphere 23.145 0.600 1.80 46.6 S2 Sphere 4.040 2.000 S3 Asphere 12.035 0.900 1.55 71.7 S4 Asphere 3.750 1.564 S5 Sphere 95.159 1.422 1.85 23.8 S6 Sphere -12.532 0.716 S7 Sphere -4.921 1.381 1.83 37.2 S8 Sphere 207.676 0.080 S9 Asphere 10.191 1.887 1.77 49.2 S10 Asphere -5.751 1.617 S11 (STO) Sphere Infinity -0.320 S12 Asphere 10.518 1.592 1.50 81.6 S13 Asphere -7.364 0.300 S14 Sphere 21.455 2.620 1.50 81.6 S15 Sphere -3.230 0.600 1.81 25.5 S16 Sphere -257.040 1.702 S17 Asphere -143.603 1.339 1.85 40.1 S18 Asphere -9.120 2.100 S19 Sphere Infinity 0.500 1.52 64.2 S20 Sphere Infinity 0.392 IMA Sphere Infinity - -

[0106] Table 4

[0107] Table 5 lists the aspherical coefficients of each aspherical lens in the present embodiment, K is the quadratic surface constant of the surface, A4, A6, A8, A 10 , A 12 are the aspherical coefficients of the fourth order, the sixth order, the eighth order, the tenth order, and the twelfth order, respectively.

[0108]

[0109]

[0110] Table 5

[0111] According to Figure 2 and table 1, table 4 and table 5, the present embodiment can provide an ultra-wide angle imaging system with ultra-wide angle, large aperture, high resolution and small volume.

[0112] Embodiment 3:

[0113] Figure 3 Figure 1 is a schematic structural diagram of the ultra-wide angle imaging system of embodiment 3 of the present application.

[0114] In embodiment 3, along the direction of the optical axis from the object side to the image side, the third lens L3 is a convex-convex lens, the fourth lens L4 is a concave-concave lens, the fifth lens L5 is a convex-convex lens, the eighth lens L8 is a concave-concave lens, and the ninth lens L9 is a convex-convex lens; the second lens L2, the fourth lens L4, the fifth lens L5 and the ninth lens L9 are aspherical lenses.

[0115] The following table 6 lists the relevant parameters of each lens of the present embodiment, including surface type, curvature radius R value, thickness, refractive index of material, Abbe number:

[0116]

[0117]

[0118] Table 6

[0119] Table 7 lists the aspherical coefficients of each aspherical lens in the present embodiment, K is the quadratic surface constant of the surface, A4, A6, A8, A 10 , A 12 are the aspherical coefficients of the fourth order, the sixth order, the eighth order, the tenth order, and the twelfth order, respectively.

[0120] Surface No. K [A4] [A6] [A8] A 10 ]]> A 12 ]]> S3 0.0000 8.6078E-03 -1.0469E-03 8.6842E-05 -9.8235E-06 4.0531E-07 S4 -0.3624 1.4250E-02 -1.3013E-03 1.0967E-04 -3.7122E-05 2.8521E-06 S7 -0.1637 9.2216E-03 -5.8278E-04 1.3294E-04 -1.4177E-05 8.0610E-07 S8 0.1699 -1.6625E-02 1.7388E-03 -1.4613E-04 -4.0666E-06 7.5047E-07 S9 0.0745 -9.8381E-03 1.6130E-03 -1.4100E-04 3.7789E-06 -3.2661E-08 S10 0.0000 6.0363E-03 2.5177E-04 9.5003E-06 5.5443E-06 -9.8918E-07 S17 -0.3047 -1.9192E-03 1.9934E-04 -3.0163E-05 2.8875E-06 -1.1941E-07 S18 0.0742 4.6915E-03 -1.5370E-04 2.5479E-05 -2.0120E-06 1.0141E-07

[0121] Table 7

[0122] According to Figure 3 And Table 1, Table 6 and Table 7, the embodiment can provide a super wide angle imaging system with super wide angle, large aperture, high resolution and small volume.

[0123] Embodiment 4:

[0124] Figure 4 The structure diagram of the super wide angle imaging system in embodiment 4 of the present application.

[0125] In embodiment 4, along the direction of the optical axis from the object side to the image side, the third lens L3 is a concave-convex lens, the fourth lens L4 is a concave-concave lens, the fifth lens L5 is a convex-convex lens, the eighth lens L8 is a concave-concave lens, and the ninth lens L9 is a convex-convex lens; the third lens L3, the fourth lens L4, the fifth lens L5 and the ninth lens L9 are aspherical lenses.

[0126] Table 8 below lists the related parameters of each lens in the embodiment, including surface type, curvature radius R value, thickness, refractive index of material, and Abbe number:

[0127]

[0128]

[0129] Table 8

[0130] Table 9 lists the aspherical coefficients of each aspherical lens in the embodiment, K is the quadratic surface constant of the surface, A4, A6, A8, A 10 , A 12 , A 14 , A 16 are the aspherical coefficients of the fourth order, the sixth order, the eighth order, the tenth order, the twelfth order, the fourteenth order and the sixteenth order, respectively.

[0131] Surface No. K [A4] [A6] [A8] A 10 ]]> A 12 ]]> A 14 ]]> A 16 ]]> S5 8.2304 1.2250E-03 -3.5841E-04 1.4408E-05 -4.4530E-06 2.6858E-10 6.7144E-08 -9.0657E-09 S6 0.3968 5.5789E-03 -1.0926E-03 1.3413E-04 -9.6931E-06 2.3027E-07 1.3952E-08 1.0804E-09 S7 -2.4132 2.7825E-03 -1.2408E-03 3.3954E-04 -4.2001E-05 2.3919E-06 8.0502E-08 -9.9613E-09 S8 -9.2889 -2.2835E-03 -1.8980E-04 -8.6867E-06 3.4708E-06 -1.6906E-07 -8.0499E-09 1.4359E-09 S9 0.0108 1.2267E-03 -3.2651E-04 1.6108E-05 1.9488E-06 -2.4578E-07 -5.6464E-10 7.8484E-10 S10 24.1112 3.9991E-03 1.2755E-04 1.8433E-05 2.6952E-06 -1.3367E-06 1.5187E-07 -5.6932E-09 S17 -3.7825 6.7668E-04 2.8256E-05 4.5089E-06 -9.6355E-07 7.7162E-08 -2.6582E-09 0.0000E+00 S18 -6.8641 5.1930E-04 1.2180E-05 1.5944E-05 -2.0017E-06 1.2686E-07 -3.8068E-09 0.0000E+00

[0132] Table 9

[0133] According to Figure 4 And Table 1, Table 8 and Table 9, the embodiment can provide a super wide angle imaging system with super wide angle, large aperture, high resolution and small volume.

[0134] The present application is configured with nine lenses, by reasonably distributing the optical power of each lens, optimizing the shape of each lens, and reasonably setting the parameters, the super wide angle, large aperture, field of view angle up to 160°, aperture number FNO up to 1.8, high resolution, light weight, small volume, pixel up to 35 million, and high and low temperature (-40~85°) process without defocus, ensure the imaging quality.

[0135] The above merely describes one embodiment of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-wide-angle imaging system, comprising, along the optical axis from the object side to the image side, the following components in sequence: The system comprises nine lenses with optical power: a first lens (L1) with negative optical power, a second lens (L2) with negative optical power, a third lens (L3) with positive optical power, a fourth lens (L4) with negative optical power, a fifth lens (L5) with positive optical power, a sixth lens (L6) with positive optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, and a ninth lens (L9) with positive optical power. The feature is that... Both the first lens (L1) and the second lens (L2) are convex-concave lenses; The image-side surfaces of the third lens (L3), the fifth lens (L5), and the ninth lens (L9) are all convex. The object-side surfaces of the fourth lens (L4) and the eighth lens (L8) are both concave. Both the sixth lens (L6) and the seventh lens (L7) are biconvex lenses; The combined focal length fa of the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), and the fifth lens (L5) satisfies the following relationship with the effective focal length f of the ultra-wide-angle imaging system: -4.0≤fa / f≤6.

0.

2. The ultra-wide-angle imaging system according to claim 1, characterized in that, The seventh lens (L7) is cemented to the eighth lens (L8).

3. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f1 of the first lens (L1) and the effective focal length f2 of the second lens (L2) satisfy the following relationship: 0.2≤f1 / f2≤0.

9.

4. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f2 of the second lens (L2) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4.5≤f2 / f≤-3.

0.

5. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f3 of the third lens (L3) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.9≤f3 / f≤5.

0.

6. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f4 of the fourth lens (L4) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -4≤f4 / f≤-0.

9.

7. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f5 of the fifth lens (L5) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.4≤f5 / f≤5.

6.

8. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f5 of the fifth lens (L5) and the effective focal length f6 of the sixth lens (L6) satisfy the following relationship: 0.5≤f5 / f6≤2.

5.

9. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f7 of the seventh lens (L7) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 1.6≤f7 / f≤2.

3.

10. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f8 of the eighth lens (L8) and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: -1.6≤f8 / f≤-0.

8.

11. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The combined focal length f78 of the seventh lens (L7) and the eighth lens (L8) and the effective focal length f9 of the ninth lens (L9) satisfy the following relationship: -2.8≤f78 / f9≤-1.

0.

12. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The combined focal length fb of the sixth lens (L6), the seventh lens (L7), the eighth lens (L8), and the ninth lens (L9) satisfies the following relationship with the effective focal length f of the ultra-wide-angle imaging system: 2.1≤fb / f≤3.

5.

13. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The back focal length BFL of the ultra-wide-angle imaging system and the total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.1≤BFL / TTL≤0.

3.

14. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The total optical length TTL of the ultra-wide-angle imaging system and the effective focal length f of the ultra-wide-angle imaging system satisfy the following relationship: 8.0≤TTL / f≤8.

9.

15. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The air gap C56 between the fifth lens (L5) and the sixth lens (L6) and the total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.0≤C56 / TTL≤0.

3.

16. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The center thickness CT4 of the fourth lens (L4) on the optical axis, the center thickness CT5 of the fifth lens (L5) on the optical axis, and the total optical length TTL of the ultra-wide-angle imaging system satisfy the following relationship: 0.05≤(CT4+CT5) / TTL≤0.

4.

17. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The diagonal length IH of the effective pixel area on the imaging surface of the ultra-wide-angle imaging system satisfies the following relationship with the effective focal length f of the ultra-wide-angle imaging system: 1.1≤IH / f≤1.

7.

18. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective half-aperture DT11 of the object side of the first lens (L1), the effective half-aperture DT31 of the object side of the third lens (L3), and the effective half-aperture DT32 of the image side of the third lens (L3) satisfy the following relationship: 0.6≤DT11 / (DT31+DT32)≤1.

4.

19. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f2 of the second lens (L2) and the center thickness CT2 of the second lens (L2) on the optical axis and the center thickness CT3 of the third lens (L3) on the optical axis satisfy the following relationship: 5.5≤f2 / (CT2-CT3)≤20.

20. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The effective focal length f3 of the third lens (L3) and the center thickness CT2 of the second lens (L2) on the optical axis and the center thickness CT3 of the third lens (L3) on the optical axis satisfy the following relationship: -25≤f3 / (CT2-CT3)≤-3.

21. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The radius of curvature R71 of the object side of the seventh lens (L7) at the optical axis and the center thickness CT7 of the seventh lens (L7) at the optical axis satisfy the following relationship: 1.6≤R71 / CT7≤8.

6.

22. The ultra-wide-angle imaging system according to any one of claims 1 to 2, characterized in that, The total optical length TLL of the ultra-wide-angle imaging system and the center thickness CT8 of the eighth lens (L8) on the optical axis satisfy the following relationship: 38.1≤TTL / CT8≤38.6.

Images